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'Flavius Valerius Leo' (401–18 January 474), known in English as 'Leo the Thracian' or 'Leo I', was a Byzantine emperor who ruled from 457 to 474. He was the last of a series of emperors placed on the throne by Aspar, the Alan serving as commander-in-chief of the army.
Leo's coronation as emperor on February 7 457, was the first known to involve the Patriarch of Constantinople. Leo I made an alliance with the Isaurians and was thus able to eliminate Aspar. The price of the alliance was the marriage of Leo's daughter to Tarasicodissa, leader of the Isaurians who, as Zeno, became emperor in 474.
During Leo's reign, the Balkans were ravaged time and again by the East Goths and the Huns. However, these attackers were unable to take Constantinople thanks to the walls which had been rebuilt and reinforced in the reign of Theodosius II and against which they possessed no suitable siege engines.
Leo's reign was also noteworthy for his influence in the Western Roman Empire, marked by his appointment of Anthemius as Western Roman Emperor in 467. He attempted to build on this political achievement with an expedition against the Vandals in 468, which was defeated due to the treachery and incompetence of Leo's brother-in-law Basiliscus. This disaster drained the Empire of men and money. The expedition, which cost 130,000 pounds of gold, was comprised of 1,113 ships carrying 100,000 men, but in the end lost 600 ships.

Leo's greatest influence in the West was largely inadvertent and at second-hand: the great Goth king Theodoric the Great was raised at Leo's court in Constantinople, where he was steeped in Roman government and military tactics, which served him well when he returned after Leo's death to become the Goth ruler of a mixed but largely Romanized people.
Leo died of dysentery at the age of 73 on January 18, 474.

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